Question: Which is the county seat for location of Lewis and Clark Expedition?
Paraphrase: Which is the district situate for area of Lewis and Clark Undertaking?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q505802 wdt:P276 ?obj . ?obj wdt:P31 wd:Q62049 } 
Answer: Council Bluffs, St. Charles, Yankton